The temperature dropped a staggering 18 degrees in Calgary, from a high of 29°C on Monday to just 11°C on Tuesday.
In Edmonton, the drop was less substantial, from 24°C on Monday to 17°C on Tuesday; however, it was enough to make residents wonder if summer is at an end.
Normally, such a sharp contrast between cold and warm air would trigger massive thunderstorms, said Mark Robinson, a meteorologist at The Weather Network.
However, the warm air that settled over southern Alberta was very dry.
“Without the moisture you aren't going to get anything,” Robinson said.
The cooler temperatures persisted Wednesday, bringing light snow to some of the mountain passes. Webcams at Marmot Basin and Lake Louise both showed flurries falling on their otherwise green slopes.
Edmonton can expect a brief return to seasonal temperatures on Thursday, but Calgary's temperatures will hover in the teens throughout the rest of the week.
The Weather Network's Fall Outlook is calling for near-normal temperatures and precipitation for Alberta this year.
For a closer look at the weather in your area, head to the Alberta Cities Index. You can also tune into The Weather Network on TV for up-to-date coverage.